Trail Notes | Female Athlete Racing

8 to 16 hours of patience

Stepping Up

to the 100km.

Most of us who struggle at 100km do not run out of fitness. We run out of gut, or we run out of patience in the first three hours.

The 100km, roughly 8 to 16 hours, is the long-distance goal that matters for most Australian trail runners. Surf Coast Century, the UTA 100, Tarawera, Kosci and the Grampians Peaks Trail all live around here. It is the distance where ultrarunning becomes a different sport, and it needs a more flexible schedule, around eight to twelve hours a week, and manageable life stress.

It is achievable within a year of ultra training, but only if most of the key adaptations are genuinely tracking. With a solid marathon background and a year or more of trail running, twelve to eighteen months is realistic. Starting from scratch, expect eighteen to twenty-four months before the musculoskeletal and gut adaptations are ready to be trusted at this duration.

Trail Note  ·  01

How the training is built

At peak, weekly volume sits around sixty to ninety kilometres. The long run builds to thirty-five to forty kilometres, and you start to include back-to-back long days, for example twenty-eight kilometres on Saturday and twenty on Sunday, so you learn to run on tired legs. Where recovery allows, you can carry two quality sessions a week.

Two kinds of durability matter at 100km, and they build on different timelines.

Metabolic durability — holding your pace without cardiac drift, processing fuel efficiently across eight hours — responds to training within months. You can see it improving inside a single training block. Musculoskeletal durability — the ability to maintain form and tissue integrity in the final twenty kilometres when every other system is begging you to collapse — is slower. Tendons, bone, and connective tissue remodel on a twelve to twenty-four month timeline that consistent load builds and volume spikes cannot shortcut.

The back-to-back long days are in the program to build the second type. Not fitness. Resilience.

Trail Note  ·  02

Why the gut is the gatekeeper

Eight to sixteen hours introduces a fuelling demand that is poorly understood by many of us coming up to this distance. In the luteal phase of the cycle, higher progesterone slows gastric emptying and gut transit. If you have never practised eating during exercise, this is where the day unravels, and it unravels through your stomach long before it unravels through your legs.

The fix is unglamorous and it works. Build gut training into your long runs from the earliest stages of preparation, so that by race day eating on the move is a trained skill rather than a hopeful experiment.

Trail Note  ·  03

Pace the first third like it costs nothing

Pacing data from very long ultras found that sex did not consistently change pacing strategy. What it did show is that slower finishers across every group tended to start proportionally faster than their eventual pace could sustain. The early enthusiasm is the trap, not the terrain.

So the cue is simple. The first third should feel too easy. Hold back harder than feels necessary for the first three to four hours. You can always build into the race later. You cannot recover from a first third run on adrenaline.

If you are racing in the luteal phase, hold back even harder in the first third than you think necessary. Progesterone elevates resting heart rate and increases perceived effort at any given pace — which means the run will feel harder than your fitness suggests it should, particularly in heat. The temptation is to push through the feeling. The smarter move is to trust effort over pace, run by feel not by watch, and build from hour four onward rather than hour one.

TRAIL NOTE  ·  04

The tissue that training cannot rush

The eighteen to twenty-four month timeline is not arbitrary. It maps to the specific adaptations that protect you at 100km.

Cardiovascular fitness responds quickly — measurable gains arrive within six to twelve weeks. Aerobic enzymes and mitochondrial density adapt across months. But tendons, ligaments, bone cortex, and the cartilage under your kneecap operate on a different clock entirely. They remodel slowly, responding to load but unable to accelerate on demand.

Women carry a specific consideration here. Oestrogen plays a role in tendon stiffness and bone density. In the perimenopausal and postmenopausal years the oestrogen-cartilage connection changes, and load tolerance changes with it. This does not mean stopping. It means respecting the timeline with even more precision than a younger athlete might.

Bone stress injuries are the most common serious injury in female trail runners building toward longer distances. They are almost always preceded by a load spike — a big training block, a race too soon, a return from illness that moves faster than the bone can absorb. The soft tissue gives you warning signals. Bone does not always.

The fix is not complicated. Build load by no more than ten to fifteen percent per week across a training block. Treat rest weeks as load weeks, not lost weeks — they are when the bone actually mineralises. And respect the difference between aerobic readiness (which can arrive inside a year) and structural readiness (which cannot).

Trail Note  ·  05

If you came to this later, you are not behind

Comrades Marathon data places peak performance age in women at around thirty-six years, compared with around thirty in men. If you came to ultra running in your thirties or later, as so many of us do, you are not past your best. Your capacity for long-distance ultra performance keeps developing into your mid-to-late thirties and beyond.

Hold that thought when the timeline feels slow. The eighteen to twenty-four months of building is not time you are losing. It is time you are arriving exactly on schedule for the body you are growing into.

arrive with evidence, not hope

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